Hair clipper shear blade assembly



June 18, 1963 M. ANDIS HAIR CLIPPER SHEAR BLADE ASSEMBLY Filed April 50, 1962 INVENTOR. l/4W/[W 44 0/:

M 1 MM United States Patent 3,093,902 HAIR CLIPPER SHEAR BLADE ASSEMBLY Mathew Andis, Racine, Wis., assigns: to Andis Cllpper Co., Racine, Wis., a corporation of Wisconsin Filed Apr. 30, 1962, Ser. No. 191,045 9 Claims. (Cl. 30-223) This invention relates to a hair clipper shear blade assembly.

The present invention represents an improvement on the subject matter of my Patent 2,892,255, the object being to rid the blade assembly of clippings and other foreign matter and facilitate lubrication by the provision of gnooves cut either in the comb plate or the oscillating blade and extending in a direction generally parallel to the direction of the teeth. The grooves may be located either centrally of the teeth or between the teeth. They may be spaced at the same spacing as the teeth or any other spacing. There may be fewer grooves than teeth or there may be more grooves than teeth.

Any foreign matter which enters between the recipnocating blade and the comb plate tends to spring the blades apart and to cause improper functioning of the teeth. The difliculty is particularly evident in the case of the quick detachable comb plate such as that disclosed in my former patent above identified. I have found that by providing the grooves herein disclosed, which open through the bearing surfaces \of the blades into the channels with which such blades are conventionally provided, any clippings or other foreign matter finds its way out of the blade assembly without springing the blades apart. In addition, the oil provided for the lubrication of the blade assembly appears to be much more satisfactorily distributed and much more effective for lubrication when the grooves are used as herein disclosed.

In the drawings:

FIG. 1 is a fragmentary cross-sectional view taken through the head of a hair clipper embodying the present invention.

FIG. 2 is a bottom plan view on a reduced scale showing the bed portion of the clipper case with the comb plate or stationary blade removed and shown in displaced position.

FIG. 3 is a plan view of a comb plate embodying the invention.

FIG. 4 is a view in perspective showing relatively separated slide and slideway parts respectively attached to the comb plate and clipper bed.

FIG. 5 is an enlarged fragmentary view in inverted plan showing the reciprocable blade of a blade set embodying the invention.

FIG. 6 is a detail view taken in section on the line 6-6 of FIG. 5.

FIG. 7 is a view similar to FIG. 5 showing a slightly modified blade.

FIG. 8 is a detail view taken in section on the line 8-3 of FIG. 7.

FIG. 9 is an enlarged fragmentary detail view in plan of a bed plate of a blade assembly embodying the invention.

FIG. 10 is a detail view taken in section on the line 10-10 of FIG. 9.

FIG. 11 is a view similar to FIG. 9 showing a modified bed plate.

FIG. 12 is a view taken in section on the line 12-12 of FIG. '11.

The clipper case 15 has a bed 16 to which the comb plate 18 is secured by means of a slide 20 and channel 22 in accordance with the disclosure of my Patent 2,892,255. The channel 22 is screwed to the bed 16 of clipper case 15. The slide 20 is screwed to the comb plate 18.

3,093,902 Patented June 18, 1963 The channel 22 has a side flange 24 and opposing side flanges 26 and 28 connected by a web 30. The web 30 has a lateral extension at 32 between the discontinuous side flanges 26, 28. The channel provides a guideway which closely fits the slide 20.

Slide 20 has an aperture at 34 within one end of which there is formed a lip 36, the surface of which is beveled at 38. The tongue 40 struck from the web 30 of the channel 22 is receivable through the aperture 34 and is sufficiently resilient to be sprung over the lip 36 to engage its bevelled surface 30. This forms a very secure and rigid connection which permits the comb plate 18 to be mounted and dismounted by simply manipulating it to move the slide 20 respecting the channel 22 to and from positions in which the lip 36 is engaged beneath tongue 40 as described in my former patent.

The reciprocable blade 50 has a relatively narrow bearing surface at 52 adjacent its teeth 54. It is provided with a shallow channel or relief at 56 between the bearing surface 52 and another narrow bearing surface 58 along its rear margin.

The shear plate 18 has transverse bearing surfaces 60 and 62 which register respectively with bearing surfaces 52 and 58 of the reciprocable blade. The stationary teeth 64 of the shear plate 18 have surfaces flush with those of the adjacent bearing surface 60 just as the teeth 54 of the reciprocable blade have surfaces flush with those of the bearing surface 52.

According to the present invention either or both of the blades are provided with grooves opening into the channel 56 across their mating bearing surfaces. Thus, the reciprocable blade 50 has shallow cuts or grooves 65 traversing the bearing surface 52 :at points between the teeth 54. It has similar cuts or grooves at 66 spanning the bearing surface 58.

Likewise the comb plate or stationary blade 18 is provided, in the preferred embodiment, with cuts or grooves 70 spanning its bearing surface '60 and opening from the spaces between its teeth 64. It likewise has cuts or grooves 72 spanning its bearing surface 62.

The construction shown in FIGS. 7, 8, 11 and 12 is essentially similar except that the grooves 640 in FIGS. 7 and 8 are on the center lines of the several teeth 54 instead of being aligned with the spaces between teeth. Since they are in the center lines, they do not open at their forward ends as do the corresponding grooves 65 of FIGS. 5 and 6. The grooves 660 are likewise laterally offset slightly from the position shown in FIG. 5 but there is no difference otherwise.

In FIG. 11 the grooves 700 correspond to those shown at 70 in FIG. 9 except that they are lined up with the teeth 64 and hence do not open at their forward end. The grooves 720 correspond to grooves 72 in everything except position.

When the relatively fixed and movable blades are registered for use, as in FIG. 1, their bearing faces, extending onto the respective teeth, will be in contact throughout and their respective channels 56 and 76 will be in registry as shown in FIG. 1. Many clippers provide for adjustment of one or another of the blades to vary the relative projection of their respective teeth. Such adjustment does not in any way affect the ability of the bearing surfaces to free themselves of foreign matter without being wedged apart thereby.

The reciprocation of the movable blade '50 may be effected in any desired manner. As shown, the armature 80 has an arm at 81 which engages the bifurcated arm 82 on the movable blade, whereby motion of the armature is communicated to the reciprocable blade in the usual manner.

I claim:

1. In a blade set for a hair clipper the combination of relatively fixed and movable blades having complementary teeth and complementary bearing surfaces extending transversely of the blades along the bases of the teeth, at least one such blade being provided with shallow grooves intersecting its said bearing surface.

2. A hair clipper blade set comprising relatively fixed and movable blades provided with complementary teeth, said blades having registering bearing surfaces in mutual contact, one such surface extending along the bases of the respective teeth of each blade and another one being spaced rearwardly therefrom, the blades being formed to provide clearance between the bearing surfaces at the bases of the teeth and the bearing surfaces spaced rearwardly therefrom, at least one blade being provided with grooves intersecting one of its said bearing surfaces and opening into the clearance space between blades.

3. A blade set according to claim 2 in which grooves intersect at least one bearing surface adjacent the base of the teeth of a blade and at least one bearing surface remote from the teeth.v

4-. A blade set according to claim 2 in which certain of said grooves register with spaces between teeth and open forwardly into such spaces aswell as rearwardly into the clearance space between the blades.

5. A blade set according to claim 2 in which certain of the grooves register with respective teeth and are closed at their forward ends.

6. A hair clipper blade set comprising a shear plate having a row of teeth at its forward margin and a trans versebearing surface adjacent the bases of said teeth and extending onto said teeth, said shear plate having a second bearing surface extending transversely thereof remote from said teeth, a reciprocable blade mounted :on :a shear plate and having a row of teeth along its forward margin and a bearing surface complementary to the first mentioned bearing surface of the shear plate and extending along the bases of the teeth of the reciprocable blade and onto said last mentioned teeth, said blade having a second bearing surface spaced from its first mentioned bearing surface and registering with the second mentioned bearing surface of the shear plate, at least one of the several bearing surfaces being interrupted at short intervals by grooves intersecting said one bearing surface, there being clearance between the shear plate and the blade intermediate the first and second bearing surfaces of the shear plate and with which clearance the grooves communicate.

7. A blade set according to claim 6 in which each of the several bearing surfaces is intersected by said grooves, all of which open into said clearance.

8. A blade set according to claim 6 in which certain of said grooves open forwardly between certain of said teeth.

9. A blade set according to claim 6 in which certain of said grooves extend at least partially onto certain of the teeth, said last mentioned grooves being closed at their forward ends.

No references cited. 

1. IN A BLADE SET FOR A HAIR CLIPPERR THE COMBINATION OF RELATIVELY FIXED AND MOVABLE BLADES HAVING COMPLEMENTARY TEETH AND COMPLEMENTARY BEARING SURFACES EXTENDING TRANSVERSELY OF THE BLADES ALONG THE BASES OF THE TEETH, 